Thomas holliday



UNITED STATES.

ATENT rrrea.

NAPHTHOL-DYED FABRIC].

SPECIFICATION forming part of Letters Patent No. 355,935, dated January 11, 1887.

Application filed September 15, 1886.

To all whom it may concern.-

Be it known that I, THOMAS HOLLIDAY, of Huddersfield, in the county of York, United Kingdom of Great Britain, have invented certain new and useful Improvements in the Treatment of Cotton or other Fiber, of which the following is a full, clear, and exact desoription.

This invention consists in the combination of cotton or other fiber with oxide or'soap of lead and alpha or beta naphthol or coloringmatter formed with them, which is the result of the process described in the application for Letters Patent for improvements in the treatment of cotton or other vegetable fiber, filed October 23, 1885, Serial No. 180,747.

The object of this invention is to produce cotton or other fiber upon which azo coloringmatter may be formed, and it is carried into effect by treating the fiber with a solution of a salt of lead in caustic alkali, and when a soap is required passing the said fiber through a soap solution or an emulsion, and, finally, treating the fiber thus prepared with napthol in solution or suspension. A good method of accomplishing this result is to steep the fiber in a solution composed of ten pounds of acetate of lead in two hundred gallons of water, to which enough caustic soda has been added to precipitate all the lead and to redissolve theprecipitate. In about thirty minutes the fiber may be washed, when it will be found to have fixed a considerable quantity of oxide of lead. It is then passed through asoap solutionsay five pounds castile-soap in one hundred gallons of water-and, after again washing in water, the fiber will be found impregnated with lead soap.

Serial No. 213,627. (No specimens.)

The proportions may be varied, and other salts of lead or other alkali may be used. Though a soap is preferred, an emulsion may be substituted when desired.

In preparing the fiber for the reception of the coloring-matters, itmay be passed through a neutral solution of a salt of lead and afterward through a solution of caustic soda or potash; or the soluble soap may be mixed with a caustic alkali. The fiber, after having the oxide of lead or lead soap deposited upon it, is impregnated with a solution of, say, five pounds ofalpha or beta naphthol in one hundred gallons of warm water, and will then be ready for" the formation of any azo coloringmatter having naphthol as a constituent. Those insoluble or nearly insoluble in water are preferred; or the color may be formed simultaneously with the absorption of the naphthol, or in any other known manner.

The naphthol may be added to the bath of soluble soap and be absorbed by the fiber at the time of the formation of the lead soap.

The fiber may be treated in the raw state or manufactured, and after treatment can be identified by the usual methods of analysis.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is- I As a new and improved article of manufacture, the combination 'of cotton or other fiber with oxide or soap of lead and alpha or beta naphthol, or coloringmatter formed with them, substantially as described.

THOMAS HOLLIDAY.

Witnesses:

EDWARD COOKSHAW, JOHN WILLIAM SYKEs. 

